NEET Biology question

How many PGAL are produced by glycolysis of 3 molecules of glucose? How many ATP are released by respiration of these PGAL till formation of CO2 and H2O?

(A)4 PGAL- 80 ATP
(B)6 PGAL-160ATP
(C)4 PGAL-40ATP
(D)6 PGAL-120ATPCorrect

Answer: (D)

Solution

Each glucose molecule is split into 2 molecules of glyceraldehyde-3-phosphate (PGAL), so 3 glucose molecules yield 6 PGAL. Counting forward from PGAL (i.e., the gross payoff phase of glycolysis plus pyruvate oxidation plus the Krebs cycle, without re-subtracting the earlier 2-ATP investment already spent before PGAL

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Question ID VK-113215